:root {
            --hbosco-primary: #bb2224;
            --hbosco-primary-dark: #8e1a1b;
            --hbosco-secondary: #2d3436;
            --hbosco-accent: #f8f9fa;
            --hbosco-text: #333333;
            --hbosco-text-light: #636e72;
            --hbosco-border: #dfe6e9;
            --hbosco-white: #ffffff;
            --hbosco-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --hbosco-container-width: 1300px;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
            color: var(--hbosco-text);
            line-height: 1.8;
            background-color: #fcfcfc;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* Typography */
        h1, h2, h3, h4 {
            line-height: 1.2;
            color: var(--hbosco-secondary);
            margin-bottom: 1.5rem;
            white-space: normal;
        }

        h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; }
        h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 700; border-left: 6px solid var(--hbosco-primary); padding-left: 1rem; }
        h3 { font-size: clamp(1.2rem, 2vw, 1.6rem); font-weight: 600; }
        p { margin-bottom: 1.2rem; word-break: break-word; overflow-wrap: break-word; }

        /* Layout */
        .hbosco-container {
            max-width: var(--hbosco-container-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        .hbosco-flex { display: flex; flex-wrap: wrap; }
        .hbosco-flex > * { min-width: 0; }

        /* Navigation */
        .hbosco-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid var(--hbosco-border);
            transition: all 0.3s ease;
        }

        .hbosco-nav-inner {
            height: 80px;
            justify-content: space-between;
            align-items: center;
        }

        .hbosco-logo img {
            height: 40px;
            width: auto;
            display: block;
        }

        .hbosco-menu {
            list-style: none;
            gap: 24px;
        }

        .hbosco-menu a {
            text-decoration: none;
            color: var(--hbosco-secondary);
            font-size: 15px;
            font-weight: 500;
            transition: color 0.2s;
        }

        .hbosco-menu a:hover, .hbosco-menu a.hbosco-active {
            color: var(--hbosco-primary);
        }

        /* Hero Section */
        .hbosco-hero {
            padding: 160px 0 80px;
            background: linear-gradient(135deg, #fff 0%, #fef2f2 100%);
            position: relative;
            text-align: center;
        }

        .hbosco-hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 100px;
            background: linear-gradient(to top right, #fcfcfc 49.5%, transparent 50%);
        }

        .hbosco-badge {
            display: inline-block;
            padding: 8px 20px;
            background: var(--hbosco-primary);
            color: white;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .hbosco-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--hbosco-text-light);
            max-width: 800px;
            margin: 0 auto 48px;
        }

        /* Tutorial Main Layout */
        .hbosco-tutorial-wrapper {
            padding: 64px 0;
        }

        .hbosco-tutorial-grid {
            display: grid;
            grid-template-columns: 280px 1fr;
            gap: 64px;
            align-items: start;
        }

        .hbosco-sidebar {
            position: sticky;
            top: 120px;
            background: var(--hbosco-white);
            padding: 32px;
            border-radius: 16px;
            box-shadow: var(--hbosco-shadow);
            border: 1px solid var(--hbosco-border);
        }

        .hbosco-sidebar-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 24px;
            color: var(--hbosco-primary);
        }

        .hbosco-sidebar-nav {
            list-style: none;
        }

        .hbosco-sidebar-nav li {
            margin-bottom: 12px;
        }

        .hbosco-sidebar-nav a {
            text-decoration: none;
            color: var(--hbosco-text-light);
            font-size: 15px;
            display: flex;
            align-items: center;
            transition: all 0.2s;
        }

        .hbosco-sidebar-nav a:hover {
            color: var(--hbosco-primary);
            transform: translateX(5px);
        }

        /* Content Sections */
        .hbosco-content-section {
            margin-bottom: 96px;
        }

        .hbosco-tech-card {
            background: var(--hbosco-white);
            border-radius: 20px;
            padding: 40px;
            margin-top: 32px;
            box-shadow: var(--hbosco-shadow);
            border: 1px solid var(--hbosco-border);
            transition: transform 0.3s ease;
        }

        .hbosco-tech-card:hover {
            transform: translateY(-5px);
        }

        .hbosco-tag-list {
            gap: 12px;
            margin-top: 24px;
        }

        .hbosco-tag {
            background: #f1f2f6;
            padding: 6px 16px;
            border-radius: 6px;
            font-size: 13px;
            color: var(--hbosco-secondary);
            font-weight: 500;
        }

        /* Protocol Grid */
        .hbosco-protocol-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
            margin-top: 40px;
        }

        .hbosco-protocol-card {
            background: #fff;
            border: 1px solid var(--hbosco-border);
            padding: 32px;
            border-radius: 16px;
        }

        .hbosco-protocol-header {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
            gap: 15px;
        }

        .hbosco-protocol-icon {
            width: 48px;
            height: 48px;
            background: var(--hbosco-primary);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
        }

        .hbosco-endpoint-list {
            margin-top: 15px;
            padding-left: 20px;
            color: var(--hbosco-text-light);
            font-size: 14px;
        }

        /* Use Case Matrix */
        .hbosco-matrix-section {
            background: var(--hbosco-secondary);
            color: white;
            padding: 96px 0;
            border-radius: 40px;
            margin: 64px 0;
        }

        .hbosco-matrix-section h2 {
            color: white;
            border-color: var(--hbosco-primary);
        }

        .hbosco-matrix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 24px;
            margin-top: 48px;
        }

        .hbosco-matrix-item {
            background: rgba(255,255,255,0.05);
            padding: 32px;
            border-radius: 16px;
            border: 1px solid rgba(255,255,255,0.1);
            transition: all 0.3s;
        }

        .hbosco-matrix-item:hover {
            background: rgba(255,255,255,0.1);
        }

        .hbosco-matrix-industry {
            color: var(--hbosco-primary);
            font-weight: 700;
            font-size: 14px;
            margin-bottom: 12px;
            display: block;
        }

        .hbosco-matrix-solution {
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 14px;
            color: #bdc3c7;
        }

        /* Footer */
        .hbosco-footer {
            background: #f8f9fa;
            padding: 80px 0 40px;
            border-top: 1px solid var(--hbosco-border);
        }

        .hbosco-footer-inner {
            justify-content: space-between;
            align-items: flex-start;
        }

        .hbosco-footer-brand h3 {
            font-size: 24px;
            color: var(--hbosco-secondary);
            margin-bottom: 16px;
        }

        .hbosco-footer-links {
            gap: 48px;
        }

        .hbosco-footer-col h4 {
            font-size: 16px;
            margin-bottom: 24px;
        }

        .hbosco-footer-col ul {
            list-style: none;
        }

        .hbosco-footer-col li {
            margin-bottom: 12px;
        }

        .hbosco-footer-col a {
            text-decoration: none;
            color: var(--hbosco-text-light);
            font-size: 14px;
            transition: color 0.2s;
        }

        .hbosco-footer-col a:hover {
            color: var(--hbosco-primary);
        }

        .hbosco-copyright {
            margin-top: 64px;
            padding-top: 32px;
            border-top: 1px solid var(--hbosco-border);
            text-align: center;
            font-size: 13px;
            color: var(--hbosco-text-light);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hbosco-tutorial-grid {
                grid-template-columns: 1fr;
            }
            .hbosco-sidebar {
                display: none;
            }
        }

        @media (max-width: 768px) {
            .hbosco-nav-inner {
                flex-direction: column;
                height: auto;
                padding: 20px 0;
            }
            .hbosco-menu {
                margin-top: 20px;
                gap: 12px;
                justify-content: center;
            }
            .hbosco-hero {
                padding: 120px 0 60px;
            }
            .hbosco-protocol-grid, .hbosco-matrix-grid {
                grid-template-columns: 1fr;
            }
            .hbosco-footer-inner {
                flex-direction: column;
                gap: 48px;
            }
        }

        /* Custom UI Elements */
        .hbosco-step-num {
            display: inline-flex;
            width: 32px;
            height: 32px;
            background: var(--hbosco-primary);
            color: white;
            border-radius: 50%;
            align-items: center;
            justify-content: center;
            margin-right: 12px;
            font-weight: bold;
            font-size: 14px;
        }